FR2842345A3 - MAGNETIC TORQUE FOR SPEAKER - Google Patents

Abstract

A loudspeaker magnetic core is fabricated to include a ring magnet connectable to the speaker body, a center magnet mounted in the center of the ring magnet and connectable to the speaker body, a magnetic field conductive ring plate mounted on the upper most edge of the ring magnet and a magnetic field conductive center plate mounted on the upper most edge of the center magnet to produce a magnetic loop with the magnetic field conductive ring plate.

Description

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MAGNETIC TORQUE FOR SPEAKER

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a magnetic toroid for loudspeakers and, more particularly, a compact magnetic toroid, which reduces

  considerably the weight of the speaker.

Description of Related Art

  A variety of speakers have been described for use in home stereo systems, audio / video systems, car stereo systems, etc. for voice output. A loudspeaker is fitted with a magnetic core to produce lines of magnetic force or a magnetic loop. Figures 1 and 2 illustrate a magnetic toroid for loudspeaker according to the prior art. According to this design, the magnetic toroid comprises a support base B conductive by magnetic field, a central rod D conductive by magnetic field mounted vertically on the upper center of the support base B, an annular magnet A mounted on the support base B around the central rod D conductive by magnetic field and an annular plate C conductive by magnetic field covered on the upper side of the annular magnet A around the central rod D conductive by magnetic field. If the polarity of the annular plate C conductive by magnetic field is a pole N, the polarity of the central rod D conductive by magnetic field becomes the pole S,

  thereby causing a magnetic loop E to occur.

  FIG. 3 illustrates another structure of magnetic core for loudspeaker according to the prior art. According to this design, the magnetic torus comprises a hollow support base G conductive by hollow magnetic field, a magnet F mounted in the hollow support base G conductively hollow and a plate H conductive by magnetic field covered on the upper edge of the magnet F. When the annular upper part of the hollow support base G conductive by magnetic field produces a pole N, the plate H conductive by magnetic field produces a pole S, resulting in a magnetic loop J around the plate H conductive by magnetic field in the magnetic support base G. The two designs of the prior art mentioned above have the common disadvantage of high weight. Due to the use of the base of B or G conductive support by magnetic field, the high weight of the torus

  magnetic is not favorable to portable speakers.

  Summary of the Invention The present invention was made under the circumstances in view. It is therefore the main object of the present invention to provide a magnetic toroid for loudspeakers which is compact and light. To obtain this object and others of the present invention, the magnetic toroid comprises an annular magnet connectable to the body of the speaker, a central magnet mounted in the center of the annular magnet and connectable to the body of the speaker, an annular plate magnetic field conductor mounted on the uppermost edge of the annular magnet, and a magnetic field conductive plate mounted on the uppermost edge of the central magnet to produce a magnetic loop with the annular magnetic field conductive plate . In addition, the annular magnet, the central magnet, the annular conductive plate by magnetic field and the central conductive plate by magnetic field commonly have a circular outside diameter. Once installed, the annular magnet, the central magnet, the annular magnetic conductive plate and the plate

  central conductor by magnetic field are concentric.

Brief description of the drawings

  The present invention can be more clearly understood by reference

  the following detailed description and the accompanying drawings, in which

  Figure 1 is an exploded view of a magnetic core for loudspeaker according to the prior art; Figure 2 is a transverse assembly view of the magnetic core for loudspeaker according to the prior art; Figure 3 is a cross-sectional view of another magnet core structure for loudspeaker according to the prior art; Figure 4 is an exploded view of a magnetic core for loudspeaker according to the present invention; and Figure 5 is a transverse assembly view of the magnetic core

  for loudspeaker according to the present invention.

  Detailed description of the preferred embodiment

  Referring to Figures 4 and 5, a magnetic toroid for loudspeaker according to the present invention is illustrated comprising an annular magnet 1, a central magnet 2, an annular plate 3 conductive by magnetic field

  and a central plate 4 conductive by magnetic field.

  The annular magnet 1 is connected to the conical chassis of the loudspeaker.

  The upper side of the annular magnet 1 produces a magnetic force.

  According to this embodiment, the upper side of the annular magnet 1 is the pole N. The central magnet 2 is a cylindrical magnet placed in the center of the annular magnet 1. To produce lines of magnetic force, the polarity of the central magnet 2 is reversed towards the annular magnet 1, that is to say the upper side of the central magnet 2 is the pole S. The annular plate 3 conductive by magnetic field is mounted on the upper side of the annular magnet 1. The outside diameter as well as the inside diameter of the annular plate 3 conducting by magnetic field is respectively 2 5 smaller than the annular magnet 1. Once installed in the conical chassis of the loudspeaker, the annular plate 3 conductive by magnetic field is relatively closer to the central magnet 2 than to the annular magnet 1, so that the magnetic force of the annular magnet 1 can be guided through the annular plate 3 conductive by magnetic field gnétique. The central plate 4 conductive by magnetic field corresponds to the central magnet 2 in size, and is mounted on the upper side of the central magnet 2. According to this embodiment, the annular magnet 1, the central magnet 2, the annular plate 3 conductive by magnetic field and the central plate 4 conductive by magnetic field commonly have a circular outside diameter. Once installed, the annular magnet 1, the central magnet 2, the annular plate 3 conductive by magnetic field and the central plate 4 conductive by magnetic field are concentric. Since the present invention uses the center magnet 2 instead of the heavy support base as is the case in the prior art designs, the total weight of the speaker is considerably reduced (about 30% less compared to the prior art designs of

similar output).

  A prototype magnetic toroid for loudspeaker was manufactured with the features of Figures 4 and 5. The magnetic toroid for speaker works smoothly to provide all the features

previously discussed.

  Although a particular embodiment of the present invention has been described in detail for purposes of illustration, many modifications and optimizations can be made without departing from the spirit and scope of the invention. Therefore, the present invention should not be

  limited, except for the appended claims.

Claims (3)

  1. Magnetic toroid for loudspeaker comprising: an annular magnet connectable to the body of the loudspeaker; a central magnet mounted in the center of said annular magnet and connectable to the body of the loudspeaker; a magnetic field conductive annular plate mounted on the uppermost edge of said annular magnet; and a magnetic field conductive central plate mounted on the uppermost edge of said central magnet to produce a loop   magnetic with said annular plate conducting by magnetic field.   2. Magnetic toroid for loudspeaker according to claim 1, in which the outside diameter and the inside diameter of said annular plate conducting by magnetic field are respectively smaller than the annular magnet so that said annular plate conducting by magnetic field is relatively closer to said central magnet than   said annular magnet once installed.   3. Magnetic toroid for loudspeaker according to claim 1, in which said annular magnet, said central magnet, said annular plate conducting by magnetic field and said central plate conducting by   magnetic field have a circular outer diameter and a common center.